CN1869615A - Temp. compensation device of electronic signal - Google Patents

Abstract

The invention is a temperature compensator for electronic signal, comprising: signal converter, and temperature correction unit coupled with the signal converter to make temperature correction and compensation, where the temperature correction unit comprises a digital circuit composed of first adder, first multiplier and second adder, executing temperature correction and compensation digital calculation according to the measured real-time environmental temperature value, reference temperature, temperature compensation coefficient and input signal and then producing corrected signal output, thus solving the problems of influence and low accuracy caused by temperature drift of reference voltage source of analog compensation technique.

Description

The temperature compensation means of electronic signal

Technical field

The present invention relates to a kind of temperature compensation means of electronic signal, relate in particular to a kind of be applicable to electronic signal inputs and the temperature correction of output and the device of compensation such as infrared ray, chip, temperature sensing and control, voltage source, current source.

Background technology

Development along with the electronic industry technology, not only electronic product becomes meticulousr, and the precision that transmits between electronic signal requires also to improve relatively, promptly require electronic signal in the process of transmitting, can not cause the false judgment of signal because being subjected to outside force majeure factor (as influences such as temperature variation) such as environment, therefore, in present various electronic packages or product, the capital utilizes temperature compensation means to proofread and correct automatically or manually and compensating signal, makes it not to be subjected to the influence of external temperature.

Be applied to infrared ray at present, chip, the input of electronic signals such as temperature control can for example be the U.S. the 5246292nd with the temperature correction of output and the temperature-compensation circuit or the device of compensation, 4488824,5719378,62832628,5455510,5621306,6283628,5048342,6332710,6504697,6808307,6736540,6679628,6525550, disclosed temperature-compensation circuit or device in the patents of invention such as No. 6029251, disclosed temperature-compensation circuit or device mainly are to utilize resistance in the foregoing invention patent, perhaps operational amplifier, differential operational amplifier waits and forms mimic channel, and carries out temperature correction and compensation by external reference source voltage is set.Though the technique for temperature compensation of this simulation has characteristics with low cost, when proofreading and correct and compensate, can produce the drift phenomenon as the temperature of the reference voltage source of one of signal, and the output result of effect correction and compensation causes correction accuracy inaccurate.For the method that overcomes the temperature drift has two kinds, first method, emphasis is considered the circuit design of reference voltage source or to semiconductor preparation process parameter and structure Design, temperature coefficient with reference voltage source levels off to zero as far as possible, but adopt the method and not only make complex circuit designsization, and can't get rid of the temperature drift that outer bound pair reference voltage source influence is caused fully, in addition, converter for different circuit design or application, must carry out different designs to the circuit of reference voltage source, this will increase R﹠D costs; Second method is then used general standard manufacture of semiconductor technology.Adopt the circuit design of canonical reference voltage source in the method, make temperature coefficient in the specification limit of temperature, present the ratio that is close to constant, and utilize a plurality of totalizers and multiplier to constitute the temperature correction circuit of combine digital algorithm, eliminated the temperature factor influence of reference voltage source by the hardware circuit calculation.The circuit design of adopting this this method is comparatively simple, the influence that outer bound pair reference voltage source Yin Wendu drift produces also can be excluded, and the converter of different circuit design or application all adopts the circuit design of same execution algorithm, therefore, of many uses, can reduce R﹠D costs.

Summary of the invention

The disappearance that fundamental purpose of the present invention exists in solving above-mentioned prior art.The present invention utilizes a plurality of totalizers and multiplier to constitute temperature correction circuit, carries out temperature correction, compensation to calculate by numeral.Temperature correction of the present invention, compensation are to perform calculations by the temperature coefficient with reference voltage source, thereby eliminate the influence of temperature to it.

To achieve these goals, the present invention proposes a kind of temperature compensation means of electronic signal, this device comprises: signal converter and be coupled to signal converter to carry out the temperature correction unit of temperature correction and compensation, described device carries out the temperature compensation calculation and proofreaies and correct back output input signal, described figure adjustment unit comprises at least by first adder, the digital circuit that first multiplier and second adder constitute, described first adder carries out the digital addition calculation with real time environment temperature value and reference temperature that measurement obtains, and output temperature compensated digital signal, first multiplier is to described temperature compensation digital signal, temperature compensation coefficient and the calculation of described input signal combine digital multiplication, produce reference voltage signal output as one in the input signal of second adder, and carry out numeral with described input signal and add up, produce corrected signal result output through compensation.

The accompanying drawing simple declaration

Fig. 1 is the block diagram of a specific embodiment of the present invention;

Fig. 2 is the circuit structure diagram of a specific embodiment of the present invention;

Fig. 3 is the position signal schematic representation of the temperature compensation digital signal that produces of the first adder of temperature correction of the present invention unit;

Fig. 4 is the block diagram of another specific embodiment of the present invention;

Fig. 5 is the circuit structure diagram of another specific embodiment of the present invention;

Fig. 6 is the block diagram of another specific embodiment of the present invention;

Fig. 7 is the circuit structure diagram of another specific embodiment of the present invention.

The primary clustering symbol description:

The 1-signal converter

2-temperature correction unit

The 3-analogue-to-digital converters

The 4-digital-analog convertor

The 11-temperature sensor

The 21-first adder

22-first multiplier

The 23-second adder

Embodiment

With reference to corresponding accompanying drawing the present invention is described in detail below.

Fig. 1 and Fig. 2 are respectively according to the block diagram of the temperature compensation means of the electronic signal of one embodiment of the present invention and circuit structure diagram.As shown in the figure, the temperature compensation means of electronic signal of the present invention includes: signal converter 1 and be coupled to signal converter 1 to carry out the temperature correction unit 2 of temperature correction and compensation.End at signal converter 1 is that input end is used to couple the input signal Vin that obtains, the other end is coupled to the input end of temperature correction unit 2, the other end of temperature correction unit 2 is signal output part Vout, when input signal is changed with simulation mutually in numeral, this temperature compensation means is by digital circuit calculation and it is carried out temperature correction, compensation, with more accurate and need not to consider the temperature drift of reference voltage source and the output result of correction signal converter 1.

In a specific embodiment structure of the present invention, above-mentioned signal converter 1 is in analogue-to-digital converters, the digital-analog convertor, and further be couple to temperature sensor 11 by temperature correction unit 2, to detect the actual environment temperature that reads in real time, and it is carried out analog to digital or digital to analogy conversion back as the signal numerical value T of temperature correction unit 2 when numeral is calculated, in the specific embodiment of the invention, signal numerical value T adopts 12 digital representation to represent that promptly total line length of signal numerical value T (bus length) is 12.

As shown in Figure 2, temperature correction unit 2 comprises the digital circuit that is made of first adder 21, first multiplier 22 and second adder 23 at least, and this digital circuit can be finished following algorithmic formula:

$\mathrm{\α}=\frac{\mathrm{Vin}}{\mathrm{Vref}}=\frac{\mathrm{Vin}}{\mathrm{Vref}(1+\mathrm{a\ΔT})}\×(1+\mathrm{a\ΔT})$

ΔT＝T-Tref

Wherein, Vin represents applied signal voltage, and Vref represents desirable reference source voltage, Vref (1+a Δ T) represents actual reference source voltage, a is a temperature compensation coefficient, and T is the signal numerical value of real-time detected inner actual environment temperature, and Tref is the numerical value of reference temperature.

With respect to input signal Vin, according to resulting in that above-listed calculation formula obtains:

$\mathrm{\α}=\frac{\mathrm{Vin}}{\mathrm{Vref}}$

The temperature change factor is proofreaied and correct and compensated, picked up signal output Vout.Like this, just can be under the situation of the temperature drift that need not to consider reference voltage source, by proofreading and correct the drift factorial effect of eliminating temperature coefficient, thus the output result of pinpoint accuracy ground correction data converter.

First adder 21, be used for obtaining by temperature sensor 11 and detect real-time actual environment temperature signal numerical value T and the reference temperature signal Tref that reads, reference temperature signal Tref is the reference temperature under the corresponding normal temperature, and the digital signal of the N bit length identical with signal numerical value T employing is represented, first adder 21 pairs of signal numerical value T and reference temperature signal Tref perform calculations in the mode of 2 complement codes (2s ' complement), and the temperature compensation digital signal that produces the N position is exported, its concrete N position signal that comprises as shown in Figure 3, and as one in the supplied with digital signal of first multiplier 22.

First multiplier 22, be used to obtain temperature compensation digital signal (its signal figure place is a N bit length), temperature compensation coefficient a and the input signal Vin of first adder 21 outputs, digital multiplication calculation back is carried out in these inputs produce the long correction voltage signal Vc output in M position, as one in the input signal of second adder 23.

Said temperature penalty coefficient a is varied with temperature and is produced by the reference source voltage of external circuit, and it is temporary in (not illustrating among the figure) to be backfilled to a buffer after the mode of utilizing statistical measurement is obtained.Temperature compensation coefficient a represents that with digital form in a specific embodiment of the present invention, total line length of temperature compensation coefficient a is 7, i.e. representative can compensate to 1024ppm/ ℃.

Second adder 23 is used to obtain the correction voltage signal Vc of input signal Vin and 22 outputs of first multiplier, and with them as its signal source.Second adder 23 produces the output signal Vout of J bit length carrying out add up operation back of numeral, compensate and proofread and correct with the drift factor temperature coefficient, thereby carrying out realizing temperature compensation, correction when the analog to digital signal is changed mutually, and the corrected signal of output pinpoint accuracy.

Fig. 4 and Fig. 5 have shown that respectively the temperature compensation means of electronic signal of the present invention is applied to block diagram and the structural drawing among the analog to digital conversion of signals embodiment.As shown in the figure, the temperature compensation means of the electronic signal of this embodiment comprises analogue-to-digital converters 3 and the temperature correction unit 2 that couples with it.The circuit that shows among the circuit structure of temperature correction unit 2 and Fig. 2 is roughly the same.

In this embodiment, an end of analogue-to-digital converters 3 is an input source with input simulating signal Vin ', after this simulating signal Vin ' is converted to digital signal by analogue-to-digital converters 3, and input temp correcting unit 2.The digital circuit of utilizing first adder 21, first multiplier 22 and second adder 23 to constitute in temperature correction unit 2 performs calculations to its input and proofreaies and correct, compensates back output signal Vout '.

Fig. 6 and Fig. 7 have shown that respectively the temperature compensation means of electronic signal of the present invention is applied to block diagram and the structural drawing among the digital-analog signal conversion embodiment.As shown in the figure, the temperature compensation means of the electronic signal of this present embodiment comprises digital-analog convertor 4 and the temperature correction unit 2 that couples with it.The circuit that shows among the circuit structure of temperature correction unit 2 and Fig. 2 is roughly the same.

In this present embodiment, an end of digital-analog convertor 4 is that the simulating signal input source is with input simulating signal Vin ".Simulating signal Vin " be proportional to the electric signal that adds, this electric signal can be voltage signal or current signal, is imported into temperature correction unit 2 after changing by digital-analog convertor 4.In temperature correction unit 2, utilize circuit that first adder 21, first multiplier 22 and second adder 23 constitute that the input of temperature correction unit 2 is performed calculations and proofreaies and correct, compensates the back and produce output signal Vout ".

The above is a preferred implementation of the present utility model only, and is not the qualification to the utility model protection domain.Therefore all do variations such as equivalence techniques, means to the content in instructions of the present utility model and the accompanying drawing, all are contained in the protection domain of the present utility model.

Claims (12)

1, a kind of temperature compensation means of electronic signal comprises the temperature correction unit that is used for temperature compensation and correction, the output terminal coupling of described temperature correction unit and signal converter and temperature sensor, and described temperature correction unit comprises:

First adder, obtain by described temperature sensor and detect real-time actual environment temperature signal and the reference temperature signal that reads, the data length of described actual environment temperature signal and reference temperature signal all is the N position, and described first adder produces the temperature compensation digital signal output that length is the N position by back that described actual environment temperature signal and reference temperature signal are performed calculations;

First multiplier obtains the temperature compensation digital signal of described first adder output, input signal and the length that length is the P position is the temperature compensation coefficient of K position, carries out digital multiplication calculation back and produces the correction voltage signal output that length is the M position;

Second adder obtains the input signal that described length is the P position, and exports the output signal that the back of adding up produces process temperature compensation, correction with the described correction voltage signal of described first multiplier output.

2, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described signal converter is a Digital to Analog Converter.

3, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described signal converter is the digital-analog signal converter.

4, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described temperature sensor detects and reads real-time actual environment temperature, and the real-time actual environment temperature that described detection is read represented the signal numerical value when calculating with digital signal as position, described temperature correction unit.

5, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described reference temperature signal is the reference temperature under the corresponding normal temperature, described reference temperature signal is the digital signal of employing and actual environment temperature signal same bus length.

6, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described N is the integer greater than zero.

7, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described K is the integer greater than zero.

8, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described P is the integer greater than zero.

9, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described M equals or is not equal to N+K+P.

10, the temperature compensation means of electronic signal as claimed in claim 1, wherein, described temperature compensation coefficient is varied with temperature and is produced by the reference source voltage of external circuit, and the mode by statistical measurement is backfilled in the buffer after obtaining temporary, described temperature compensation coefficient is represented with digital form, the length of described buffer is the L position, and described L is the integer greater than zero.

11, a kind of temperature compensation means of electronic signal, described device comprises:

Digital to Analog Converter, the one end is coupled to analog input signal, and obtains described analog input signal;

Be coupled to the temperature correction unit of described Digital to Analog Converter, the one end for output as a result end with output digital signal.

12, a kind of temperature compensation means of electronic signal, described device comprises:

The temperature correction unit, the one end is coupled to digital input signals, and obtains described digital input signals;

Be coupled to the digital-analog signal converter of described temperature correction unit, the one end for output as a result end with output simulating signal.

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